Because of high hardness,high wear resistance and other properties,tungsten carbide coating material is of important value in the field of aerospace and defense.As a high efficiency and low damage method,electrolytic grinding is widely used in processing tungsten carbide and in electrolytic grinding the surface integrity,and efficiency are greatly influenced by the electrolyte.Focused on the electrolytic grinding of tungsten carbide coating materials,the influence of anodic polarization curve on the chosen of electrolyte is studied.By analyzing the potentiodynamic and potentiostatic anodic polarization curve,chose a suitable electrolyte formula,the effect of which is verified by actual processing.

Fabrication of deep and micro holes on the nickel-based superalloy blade of aero engine has been a difficult problem in the field of aviation manufacturing.An electrochemical drilling process for fabricating deep and micro holes with high efficiency is introduced.In order to study the influences of high speed micro spiral electrode on machining accuracy and machining efficiency,the simulation of the gap flow field are carried out.The simulation results show the gas film with good insulation effect around the electrode can eliminate the second electrolysis of the hole wall and improve the machining accuracy greatly.In addition,the fresh electrolyte outside were forced into the machining area due to the negative pressure.Enhanced mass transfer is performed well,which can improve the machining efficiency significantly.Finally,the simulation results above were verified by the experiments,which shows that the micro electrochemical drilling process for fabricating deep and micro holes has a huge potential and broad application prospects.

The On-Load Tap Changer(OLTC)of transformer has a complex nonlinear relationship between the mechanical fault symptom and fault type,and the traditional BP neural network is used to diagnose with low accuracy,slowing convergence rate and easy to fall into local minimum value and so on.An Adaptive Genetic Algorithm(AGA) is proposed to optimize the BP neural network fault diagnosis.The weights and thresholds of BP neural networks based on adaptive genetic algorithm optimization,and then the optimized BP neural network is applied to the OLTC mechanical fault diagnosis.The simulation results show that the fault diagnosis model of BP neural network optimized by AGA algorithm is superior to the traditional BP neural network method.It can effectively improve the accuracy and speed of the mechanical fault diagnosis of OLTC.

Stretchable electronic devices are widely used in applications in biomedical devices and conformal antennas that require intimate integration with complicated surfaces of elastomers.The island-bridge layout improves the stretchability in practical flexible electronic devices,among which U-patterned interconnects have been designed to enable devices' repeatable stretchability up to 40%.While the island-bridge-substrate structure is stretched,complex deformation is observed by use of FEM.These structures suffer unilateral tension and compression,global tension and plastic deformation.The width and length\spacing ratio significantly influent the stretchability.The results demonstrate that reduction of width enhances the stretchability,while degrades it when width becomes too small.When width is large,out-plane buckling appears before cracks occur.Spacing always increases the stretchability while the dimensions would become large.When the length/spacing ratio is smaller than 1.4,the stretchability increases as it grows.Therefore,study for the deformation mechanism of U-patterned interconnects could optimize its geometry parameters and improve the stretchability of flexible electronic devices.

By analyzing the difficulties of resource management which cloud manufacturing service platform encountered in the actual development process,the scheme to build service platform depend on natural rescource of Industry-University-Research (IUR) alliance is proposed,which can reduce the difficulty of development in resource management services of cloud manufacturing operating system and improve the stability and reliability of the resources services; based on IUR rescource the overall service mode of cloud platform is designed; the construction scheme of cloud platform and the development ideas of each functional module are elaborated; finally the cloud manufacturing management system for machinery manufacturing is established and commissioning relying on a IUR research alliance repository.A certain cloud services is achieved.The service effect is summarized and evaluated.This is a beneficial attempt for the market construction and implementation of cloud manufacturing.

Quality management for glasses production workshop used to use paper as the transmission medium,which ways of information production and transmission are not only time-consuming and toilsome,but also inaccurate and non-real time and so on.In order to solving such problems,developed a information collection and evaluation program based on C/S structure by using Android terminal and Wi-Fi network to constructing field communication net.It turned out that glasses factory saved labor costs,increase work efficiency to a large extend with this system.Information collection system for glasses production workshop based on Android runs steady and reliably,helps glasses factory to increase added value,profits and raise market competitiveness.

Input shaper can effectively suppress the residual vibration of the flexible mechanism.Its robustness is an important parameter to evaluate the amplitude and the frequency range of vibration reduction of input shaper,which can be obtained by analyzing the insensitivity of the sensitivity curve.In order to obtain stronger robustness,the typical input shapers are improved by adding higher-derivative and multi-hump constraint conditions.The improved input shaper can broaden the frequency range of the residual vibration suppression.The basic principle and robust analysis method of the high order zero vibration and zero differential and multi-hump extra-insensitive input shaper are introduced,followed by the application of these methods to a model of flexible parallel manipulator.The robustness of input shapers is analyzed by numerical simulation,and the insensitivities of various input shapers are compared.Moreover,according to the system response curve,the influence of the system resonance frequency change due to the vibration suppression capability of the input shaper is analyzed.Thus the performance of various input shapers' robustness is verified.The simulation results show that the robustness of the THEI input shaper is the highest,and the synthesized performance of the DHEI input shaper is the best.

Introduced a row alternate wheel which is current widely used in the mobile robot field.Parametrizations equation of the roll surface were worked out by analyzing geometric model of roll and propose to the condition in adjacent rollers clearance.According to the wheels and ground contract condition,present a way to analyzed the deformation of wheel rim roll and ground contact condition based on non-Hertz contact theory,and the contact deformation was simulated by using ANSYS software comparison with the calculation results.Provided method basis for row alternate wheel applications.

With the continued development of laser surveying technology,the speed of data obtaining and the density of data capturing are going to better and better.At the same time,how to process the numbers of data points is becoming the main problem of model rebuilding based on laser-scanning measurement.If disposing of the data point cloud directly,the saving and processing of the numbers of data would become the unbroken bottle-neck,and the whole process from data point to model rebuilding would become uncontrolled.Now,most algorithms get the precision by losing efficient.But,the adaptive minimum distance method proposed,just is a kind of data reduction algorithm that balances the efficiency and the precision,and has been verified on its validity by an example.

In view of the problem of the energy distribution in extended-range electric vehicle,improving driving distance is designed as an assignment by proposed the multiple operation points control strategy at the condition of opening air conditioner/ heater.Using Particle Swarm Optimize(PSO) multiple best points of engine,optimization about multiple points strategy is verified though simulation by Matlab/Simulink and Advisor in NEDC.The result of test shows that the control strategy which fulfilled the designing requirement can improve the driving distance after optimization,and can improve the efficiency of energy under comparing to three points strategy which ignored air conditioner/heater.

Based on the structure fatigue loading spectrum acquisition and analysis technique,acceleration sensors and strain sensors were used to collect the loading spectrum of Automated Mechanical Transmission(AMT) main structure in Xiangfan testing ground and actual road.Then,the statistical analysis of the signal in time domain,frequency domain,and rain basin were presented.The results showed that the new gear shifting box,s vibration amplitude was larger,the peak frequency is mainly concentrated in the 12Hz arround,and the pseudo-damage value of different measuring points were similar.The results can be used in analysis of equivalent relationship of different load spectrum,and the fatigue life analysis would be achieved.

Matching high accuracy surface process in Class-A surface reconstruction is complicated.It needs a large number of operations,and cannot modify due to do not retain parameters after the surface fitting.There exist many problems which causing surface reverse reconstruction work repeatedly,therefore the thesis put forward a kind of accurate and efficient method for surface reconstruction.According to the discrete point cloud based on K-neighborhood search,using the multi-mode subsection interpolation fitted curvature continuous curves such as line,arc and other ways,retain parameter characteristics to modify conveniently,and then using the NURBS theory to fit surface,ensure the surface fitting accuracy and curvature continuous transition though adjusting the control points and the node vector or other factors.Through the analysis of case,the fitting method of Class-A surfaces is quick and accurate,it retains the shape parameter and improve the accuracy and efficiency of surface reconstruction.

Human hip joint has a S-shaped canal,the existing standard straight hip prosthesis matching with the femur cavity of the patient,will form a three-point contact and reduce the fit precision between hip prosthesis and femur cavity.The pig shank CT data is applied to reconstruct the three-dimensional model of femur cavity to as a design model of the prothesis,which is imported into robot simulation software for programming and simulation of grinding,then,the prosthesis model is copied on the copper bar by using robotic grinding technology.After the prosthesis matched with femur cavity,the matching case is detected by X-ray image,and the size error between the prosthesis and femur cavity on the cross-sectional is measured to verify the method of individualized prosthesis design and the feasibility of robot grinding prosthesis.The experimental results show that 90.84% of the matching area is less than 1mm when the femur cavity is matched with prosthesis.

The manual programming method to realize 3D surface machining that based on C compensation principle,macro program and advanced zoom function is proposed.And use the pentagram of cambered surface as the carrier,on the basis of analyzing the structure characteristics and the machining difficulty,according to this method,ascertain process and flow.Aim at different types of tool processing principle,analysis and determination of key parameters,the preparation of the program,and verify in the machine tool,and ultimately achieve the processing objectives.Successfully solved the problem of the shape of pentagram owing to the tool interference caused can not become a point.

Aiming at practical training and learning,the NC lathe simulation system is designed on VB 6.0.The system,which simulates the Fanuc-0i Mate TB NC operating system equipped by N091 NC lathe,realizes functions such as,writing NC code,checking code errors,warning on improper process properties,simulation of processing and operation training on PC.The trainers could easily master the skill of operating N091 NC lathe through this NC simulation system which,organically,combines learning and teaching visually.The design,some key technologies as well as its program code are introduced in this treatise.

Discusses how to select the appropriate programming strategy according to different geometry characteristics of the parts,and set up a reasonable tool axis vector control mode and the tools' tilt form in the application of MasterCAM five axis CNC machining programming.It also analyzes the typical characteristics of programming strategies such as directional machining of polyhedral parts,curved pipe bending machining and region surface machining,and introduces the method of setting parameters of machine tool structure with MasterCAM five axis CNC machining.

30CrNiMo8 steel is the typical material which is difficult to manufacture in the all materials.During processing,grinding force is great and grinding wheel breakage is serious,which have a great impact to the production.Aimed at grinding force of 30CrNiMo8,got the empirical formula of grinding force which is suitable for the conditions of the test by a linear regression analysis on the data from orthogonal test.According to the characteristics of the grinding wheel topography model,a reasonable mathematical model of grinding wheel is established.The grinding mechanism and the contact arc length are analyzed.According to the analysis,the precondition of the simulation is made and the condition of the grinding experiment is made.The change law of the grinding force are obtained.The experimental data and the simulation data were compared with the experimental data,and the grinding force experience formula of 30CrNiMo8 steel was obtained.

On account of the machining problem caused by pore size is small,high precision about diesel engine electronic control unit pump body oil passage hole,motion state of fluid abrasive was analyzed in the process of abrasive flow machining medium oil hole through building the oil hole squeeze grinding abrasive flow simulation model based on thorough analysis the mechanism of precision hole of abrasive flow processing,and it was further analyzed including oil passage pressure,velocity,turbulent kinetic energy and their influence on machining effect under the different squeeze grinding pressure (such as 5.1MPa,5.7MPa,6.9MPa).Results show that the adoption of 6.9MPa squeeze pressure,it is better for fluid abrasive to cross the rounded and oil duct hole wall surface treatment effect,and the machining efficiency and surface uniformity are the best.Research results can provide theoretical guidance for the next step experimental verification of pump body oil passage hole abrasive flow processing.

Five kinds of commercial sintered high speed steel and carbide tools with different tool geometries were used to heavy milling 6N01-T5 aluminum thin-walled hollow structures.The infrared temperature measurement systems were used to measure the cutting temperature and the Taguchi method was used in the experiments design of cutting temperature investigation.The results showed that the cutting temperature was the highest at the area of the intersectant ribbed slab where the value of cutting temperature was 40~60℃ higher than that of cutting the single ribbed slab and the tool often presented severe adhesive wear.Among the four cutting parameters,radial depth of cut was the most significant influence factor and followed by axial depth of cut and spindle speed.The increase of spindle speed can effectively decreased the cutting temperature.The results also showed that the use of non-wave edge,smaller helix angle or less flute was benefit for cutting temperature decreasing(by 20~40℃).The tool with a flank angle of 12 degree or a rake angle of 20 degree produced the smallest value of cutting temperature.Finally,the order of the effectiveness of the cooling methods was cryogenic pneumatic mist jet impinging,oil mist,cryogenic wind and dry cutting.

Aiming at the high energy consumption caused by disregarding the change between the power consumption of slab,the hot milling planning was formulated as a hybrid multi-objective prize collecting vehicle routing problem(Hybrid Price Collect Vehicle Routing Problem,HPCVRP) model.The model considers minimum number of rolling plan,production process constrains,and energy consumption.Combine improved feasibility priority particle comparison criteria to select the best particle,and control the number of external files with update the global optimum algorithm by filter crowding distance and congestion vector mechanism for FMOPSO(Filter-MOPSO).The simulation results indicated that this algorithm could get good distributed Pareto optimal front.The proposed method has been applied in a hot mill line to verify its availability and feasibility by comparing the manual scheduling results,which provide decision support for hot milling planner in practical work assignments.

For solving the Assembly Line Balancing Problem of type 1 (ALBP-1),an improved hybrid Partical Swarm Optimization (PSO) algorithm is proposed.This algorithm is a discrete PSO and priority weight encoding method is employed.Genetic Algorithm (GA) and Variable Neighborhood Search (VNS) algorithm are used to improve the searching performance of PSO.Moreover,in terms of objective function,smoothness index is added to improve the efficiency of assembly line.At last,by comparing severial samples,the results show that hybrid PSO algorithm can solve ALBP-1 efficiently.

In the process of the interactive modular design of Product-Service System(PSS),there has many conflicts among the customer's needs,physical modules,service modules,physical and service modules.Trying to find a suitable method to identify and resolve conflicts among modules can ensure the granularity consistency among physics modules and service modules,which also is one of the key steps to achieve PSS configuration design.Analyzes the principles of consistency evaluation after the module partition,and clarifies the content of the evaluation.Then establishes a five-step process model to assess the module consistency,and uses the quality of the house and T-test method to test the consistency of module partition.Finally,a case study of generalized transformer module partition evaluation is carried out.The method proposed can ensure the consistency among physical modules and service modules in PSS main structure,and ensure the conflict does not occur in the product and service configuration.

Aiming at providing a new kind of object positioning method,designing a kind of simple operation and easy to implement in engineering coordinate locator with applying the ultrasonic ranging principle to the object plane positioning,which has AT89S52 single chip microcomputer as its core to drive two steering engines MG946R running and two ultrasonic ranging modules US-100 sector scan.The US-100 launches ultrasonic signal and gathering feedback signals in time-sharing.The microcontroller disposing of the feedback signal and calculate the distance measurement.It is communicated with computer by RS-232 serial port and transfer measurement data to computer.The computer uses LabVIEW to display the object's coordinate azimuth and draw its mobile route dynamically in real-time.The experimental result shows that a single ultrasonic transceiver within 4 500mm measurement error between 0~17mm,the measuring blind area for 23mm.The ultrasonic device prototype's functions complete well.

3D-object reconstruction is an important part of computer vision research,it is widely used in virtual reality.The microsoft company released a 3D somatosensory camera named Kinect in 2009,making get RGB and depth information cheaper and faster.The rotation principle of spatial coordinate system and real-time 3D-object reconstruction based on Visual Studio 2010 and 3D point cloud sculpture with RGB information is described.Finally,the experiment results show that this method can effectively get RGB and 3D information,and can print out 3D models by laser sculpture machine.

The control of wind turbine's variable-pitch has many problems,such as instability and randomicity of wind energy,larger disturbance and nonlinear of wind turbine's models,etc.For solving these problems,affine nonlinear systems of wind turbine's models are proposed to be exact feedback linearization.Linear quadratic optimal control algorithm is designed based on nonlinear optimal control and validity of the algorithm is demonstrated by simulations.The simulated result proves that the linear quadratic optimal control algorithm can control that output power of wind turbine is kept within 10% of the rated power.In addition,the algorithm has other advantages such as good precision,stability,and short response time.

A new method is proposed to solve the difficult problem of single-channel mechanical signal separation.It can realize the fault signal separation by constructing a virtual channel,and can overcome the limitation of channel numbers.The separation performance was analyzed from the theory and simulation.Finally the method was applied to gearbox fault diagnosis and the result shows that it is effective.

According to optimal mode selection and key parameter identification of a new adaptive mode decomposition under variational framework Variational Mode Decomposition (VMD),from the idea of binary search,the multi-scale entropy correlation and correlation coefficient in Fourier domain are presented to solve the problem above for VMD,and its filtering essence is revealed through decomposition characteristics of bearing fault simulation signal in Fourier domain.With analysis for simulation signal and engineering application of bearing fault,the results show that,compared with Empirical Mode Decomposition(EMD) and Ensemble Empirical Mode Decomposition(EEMD),de-noising effect of the Improved VMD(IVMD) is more obvious,which is an effective adaptive mode decomposition method in Fourier domain,and can extract the weak feature frequency of fault signal more accurately,achieve correct recognition of bearing fault.

The device life data which involve more than one kind of the failure mode are often fitted by the Weibull mixtures.Due to the complex forms and the multiple parameters,the parameter estimation of these distributions is quite difficult.As to this problem above,on the basis of improving the step size scales and the probability of discovery of the Cuckoo Search (CS) algorithm,a parameter estimation of the Weibull mixtures based on the the proposed method is proposed.At first,the method need to build an optimal model for the aim of minimizing the residual sum of squares.Then,the model is solved by the improving algorithm.In the case study,the life data of the craft windshields are regarded as the fitting objects of the two-fold two-parameter Weibull.The Cuckoo Search (CS) algorithm and other three kinds of the improving Cuckoo Search (CS) algorithm are used to search the best solution for 2 000 times simultaneously.The optimization results are compared and the contrast proves that the accuracy and the success rate of the parameter estimation based on the algorithm which mixes the two improved method is the better one.

To improve the meshing performance of ZC1 worm gearing,it is necessary to analyze the instantaneous contact line of the worm gear tooth surface.Established the mathematical model of double-enveloping ZC1 worm gearing for automatic escalator based on the theories of the space meshing.The worm wheel tooth surface instantaneous contact line equation are established.At the same time,the curve of worm wheel tooth surface instantaneous contact lines are described with MATLAB,and the influence of the main design parameters on the distribution of instantaneous contact line is analyzed.The results show that center distance a,radius of tooth profile of grinding wheel ρ and lead angle γ have a certain effects on meshing performance.